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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdb1d2dd3a81bf9cc49f8bf9d24f3f1499bce9050fa37ad6abc2ea191639db7' 
  AND token = 'CRzIeuIPxznQTTocbOI811wtykMSs+9/XVnBTJ3v29U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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