SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9637f897bae08f327d6dcbdfa42fd73a0b0848b7d981253529c0c4bdfdb8cfa' 
  AND token = 'sT2kDbpJfo+VQwjzUXGSFA4lb44RghdXqFq6HNfuqBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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