Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f536c52fa1f0b997145870578d3840ce151c813b8920f5c72140e05128ebc78c' 
  AND token = '3cLP+5+GXRh5zgYfTpuveUaKU9s26y9GXqYv1fvda3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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