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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf183524662b6055a63b8655e9bdcb918028a2edd09ffc6c24f8d34eba39478' 
  AND token = 'XMGQa/8ZI4NtKV06CPZnXCDs+AV0dWNg1sXHWvW/ff4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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