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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d6264a2ce168a62c33e4e55c1839374bf114781fb8e9af42b2bfb6243da6bd' 
  AND token = 'tOSe6z7H88XG5geGUnXyj0RQIh1nv1iiyKj/T1yehdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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