SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c8ff96aea18318d1db57b25862d6d5e0e21665604caaa0c6494fffe18784d5' 
  AND token = 'K4Yl3nHafYs88UFGIDVN5qnwCYf3gFgOMh+cGXaWjkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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