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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4968a06922cd3363ec46d8df36f5c8e730e0e034af462857eb27b78ae1be69' 
  AND token = 'gm+YmyLeW56QpM/y65bW8ZMsf/7f8l0ZyblVhX9crOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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