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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c5acb6e8aeac67c9d4ae6c7b46807292b01f863fc9764578f1aa7a7cb6d338' 
  AND token = 'M/yfW7SAjMP8B3QILjWouKgQ5hIphuEH8H7uf3yFclg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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