SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6d23b0150c4eae7f102b706b38cecef784591a09046aa6d6215d5720ac88c8' 
  AND token = 'IX0jzRCoWfQxHIL85NeSkv006426V9vIJU5DPv6/od8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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