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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ca1508f01149cd87e529c890619740de8ab069bda7ed9a5149d76d0a94d8d9' 
  AND token = '2gOETjqlP1utvx2s+xfGnDE4GYizjVePAtH+N9sSabg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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