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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1358b92d08e777994cd1d426159624a0ed54def44ccf9350acba2bf74835de' 
  AND token = 'yF4/cAFz0WQMGcYxRg5B0kMHaCi99jf22CskZ9y2WdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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