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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67b6a044c08af64acff34d8651bbe3371d9486ba80c47d347fee09c77fdd785' 
  AND token = '4GPIKYEtcv4j4xyJWRmxPIHfpjPZnkwydw6nb3PVm/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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