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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bfb093cd811b7ad030a2e431ca822c20b3f1f03c586810a7211a9c34dc5e7f' 
  AND token = 'ltO2ZbU7Cjj+P54lcK6EzKIE2L+Kh7u0dqyQ6DWhB/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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