SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287712f97c22867eb99d9fb759eed090867718b0af09d2670cc68993c6d20cf1' 
  AND token = 'SyGPzjNN8xIv+i6mcc4p+OYKyVq1Oa7JULZmpJW5lBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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