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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776d215ca8cc70e357c7d4f123f281f1d634d2dd834d3428de00cbed1a1ad0c7' 
  AND token = 'IzJHxwr0h70OU9qQIA62s5LSiS7gzGnkRrJ3h/Z8yGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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