SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d9e9f70212d1568892b1927ed6a33c8da26691aa78358b240e455d13cfd973' 
  AND token = 'A90NupBesgRFjURCmDMWlbZUabiEYfgPhqUZzfxPTwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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