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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba65632d1db4ea22f9972b1e4520a905c7bca4c9ccfa0d5a039758349f5c2559' 
  AND token = '/ejDAYKaECFabGry7R/JJeslcmJYLKgT+5711UbP/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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