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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427188b6c5aabfdf4057d221298952047e37f300da7441cfa7ad90b0c26b2658' 
  AND token = 'F+wTCxBvH1SJ5cNT4ief5SHhPe81URZiOvLz9qV27TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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