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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de26b591af35d893af4d610c75adfbbb4e8456d3a0735abc1358916de67ca6dd' 
  AND token = 'CNqLUdH0CjO4DSbi15g9hlfW9kFu6GTcUgHkOEWJoR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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