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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893cac6427b9a9f8b67b38b14a033a6679438a02bffc04a0006bfb0989e52853' 
  AND token = '0kMW+9fjiy0FafYpn/W5lDCCI9HXHlDb4aZdfWIB8uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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