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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c480cb411eca971e2f5e800cef01a1a8cd3dcb96039a4fd7d22db8d7fcf677' 
  AND token = 'DWnb/pNsJ9AJAU52sUC5RlylhyamhFHXYwMvv1CoAFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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