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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55bf61aa0ebc36246546857d657b9d5b98cf4233e64e668139b162cb276e25b' 
  AND token = 'ovg8gtsLSrgSpD7T0bCi04zO/x1QqiTC1bPqAPkBo3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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