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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c63ed37a024fdce5478164558ae1eeb4e82928bb570a94e14bc07d94e03f64' 
  AND token = 'dZ/IqYpGjePam0Ng8DtKC3PgKjocf0rSYyH6lSr8oJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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