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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a2fa88d806c748d09b5026d4829de6bdb47de1ea5fc273719c83c565eb8051' 
  AND token = 'KPFNV7npnCcI9Zrq7XZgui6Xjo2WIzEkHmr8YC7bRmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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