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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412a1a8bbb6a06a3c5e91e2dcb21baccc4c5a0c2099e738775b50d0164206128' 
  AND token = '4emORXETm1Btc1oWn7KQO0YID4Z2OHfVbRQwfhxcJgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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