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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109c80e76ddea5ea5f744eac3b2fa7163dd37b00bbae733b89982ca4ba543ffa' 
  AND token = '39oS7Gr2IkbX9heTiIigivphbTWblxiynp5TipN/SW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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