SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bd182211360017ccfbb92626d55a2316ebe104e5eaac358458731ab5b3c190' 
  AND token = 'TK7PysKKzULY2KC2BRfJUAoQ8pgmZRtSmYnBQVu1jL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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