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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5c26c367d5884494f4dc3da10712fc3f1b724c34d09f83474b8a925c6d7fdb' 
  AND token = '5PAvAbYI10AQBMstJjO9SNbWzEQrxM+IpU9hLD0H7vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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