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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b1c8d80149f72617a22c690a5f514a4b46d080265e65b7b3b7d5ebe8029578' 
  AND token = 'kgO8VoVBwNRZGt79o0KTUa/Jw4ulwg0iRJgPH8HkuIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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