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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff58f10f1115eeb3d6ee9a94e2040ed2bbe8700d16fb478924d7b48eccbe992a' 
  AND token = 'gdW5YaWtgUS+Jg5iXJSMC7PyCOShi7a2TybyohDuCmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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