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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f524a4e6209550726b42e13f39a4f6be1235040ac1b204718d5982c08ef6463' 
  AND token = 'qPP+HU6RnbPdFQW2ppZAQ3ypuLmM75wnYiEie8QukLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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