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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afe9f0a87e2eb52cc5e8a4120e4d781c42d72892178e5f00597420ad904d341' 
  AND token = '88GFrZx6jj5KZacuQ5kjOtwfrvLlU95ex5bxUOVjtAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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