SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109032f38790a8ed6b35145410914ca6f87bba8c65a82dbc5ef082b010466042' 
  AND token = 'wdk4hE95q7QHHpwlBw9hxWUKYnj49+4VvHt2PDA8wyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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