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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255783d23d384ddd93357a1954e82700c8e3c846d868cc22703819fa53730e7e' 
  AND token = 'h9lpIaXKknsSGtr9Tz2YlEklzsO+SrIfpy10ZKIs0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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