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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de95c844dbde774122fba1bbaf52e8e7f1848d032310a4bdb83f9d09ed507191' 
  AND token = 'sMp9l07KODuyrX+X1mW2f8TeUZZXTZmAqa4J5aWh0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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