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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bf136773c7e9e6236fda104d3867ebb82d1f9cd93c21d3899a3b7b4b2af262' 
  AND token = 'anWEB2JM0+ee1OzUrDu+Ksb4/OpiKnyWEJycenSZNKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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