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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbfdefd40d8b8f735fc2d8cf161826a067b65c2fd2063a7b3166168d7143dbc' 
  AND token = 'oYTag9x6umZTmRYs9zH4Yny8pMU563zNXJM5jdNd8nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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