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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94e4f87acf700602bf1a50e630e6474f0ce52c93a4fb890de0aa7a575fa938b' 
  AND token = 'EqKOVG11JrPuoTHxP5O6SHrW7mX8ecLLxVn/yGZZ/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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