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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556b8919a5c00b87ef8f7668dedc058517683b9994343cb38a5fcdf4541755c0' 
  AND token = 'hFLlBbGTDcUXOVx4w1ZpOIICrFlQ95i113wxP6CV10M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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