SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103885ff1f3d822560132f4ba91d3b7d061e77c6b6c0d8beb58315579e65ba69' 
  AND token = 'I38pYTFIdyTN8v/2pJDSPqMxC+BeDWVunJ/UhfUH5KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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