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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e870e68f225e3a6c2bf435f70c6eb6d4704e3f48268d9768042e3783f73f728' 
  AND token = '+ki5RWvqAtyqWwR62szSrR1UwvgGep8PihIhlpHh6vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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