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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8271566f866b59d713d5ce441baa5de0d3f6d3747f100de51d68105b75e2bf' 
  AND token = 'dM16dIpTW3b1nwOg81R8Yhvwqn10gB85Y+V//YMYv7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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