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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74130faa9ed25f0dfa30af39e64221622b2289d130531c727d6dda08dd7dd6c6' 
  AND token = 'pQrzVA0SS5wtTlwF9+5/bzsN7ez8ClLaM+/ixxeIGeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}