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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01326bdd2dea79340034226c29642fe834a253d5c391f26e4c3140b7079bd48c' 
  AND token = 'dNuIAq2edjVTovpX1PLvwI8S7dU08142U5Vril/qLao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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