SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5b30ac1ad63cd2b60037456f5b3dab1490aedffd1e79cbcdb94f795e98c20f' 
  AND token = 'TijegfknfZwgyZ4LzsqRG85JUYAAz0M/Cdbsha3I+Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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