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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc84ff33ac3f6ec8c728a5b538b5f14ee9988dd7dff8795e92da89a3a03f944' 
  AND token = 'xBJQTQ1UKqnlsdOKFzJPl4Dw73zVa7s9u87Mk2aU1qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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