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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d363bad40cac5748a9cdfb4ad5b1d332093a7f1b176cbac3905e01ff23459c8' 
  AND token = 'acf9oT5IUShzgHOv5zZIPA1Y0x3CMvaoGYz0aj+fCDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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