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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3198d74f43f8db4d9dfa4c3f8fef1a954d9920f005594d8404447176be2b7ee7' 
  AND token = 'oX5a5ICpv6MBIsIjtDLF6a+Jec7vT5bwwOnGH9myT10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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