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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcf8d7c1ab350da64f907918c0accc0993bcde1a989aa4b20774fcc3cf73d62' 
  AND token = 'QNS7ScCIZrqN6lStkysBH9/MnFd+6UUrFaE6s/1I3UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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