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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bfa7511e41dfda11d6edc87efcb348cb7f4476c924d9479321bc87f4ba0fe1' 
  AND token = 'yKmelak549WbNLNjouukOKXT+/ZmmI2MXNACGa5e2vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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