SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad1346cee15fd58af5c5472216b498b8bc9cbec568387bfba6e8315ba20a0c4' 
  AND token = 'a3iHVR5/gbnsqxyXYhRRGtJk2lLgfnSLxvuwUUBglDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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