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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7853a53fdbfde9f81b599674e6da2f0acb27857217f0a70ae4f8b50c0acdfc' 
  AND token = '13aZ4SD0di7b6iGHrXZ/TriV3eiXw6xyBTQy+nVlGHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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