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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a2b199f58256ca8ceeb2a374df7496dd88a67329fc08f1ea95e94e956b592f' 
  AND token = '6LRsOfybanIISqP0U7J7I3y9jKiJwMHvl0G8dKY3Wlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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