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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6471430af99a20674a07eaa5a42060d87a884632fadb2bf3bc03213c66541efd' 
  AND token = 'HO5GScTIlTY0NReGxNsg3m1BdFh5536MmSLJxciyXtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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