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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c711803e370e546e57ee0e3c66222c5a48a52971ac3d1d9ef631aba3119559f' 
  AND token = 'ZK/V73LAax/CJKNp6f2t9KTeEzz0O+QDHeRepC6OhnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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