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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703a28ca5850e4f181cb411517e59c96b2f11447993eeaad33ae5e81261a9f94' 
  AND token = 'suzwpryzuA8BtwywcN/jCjdJ5WaQirQ8L4zERNdCIPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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