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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af6b82334a2867823e0046fde140a6cb396d2fbb543256b97897c357d27743' 
  AND token = 'BgKFn8KAX8il0hEC84DUaN5Yxa2uAKnQsLDoBAcZIsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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