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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1904bb100face5d4ffcc65e4f70b4de577a1de4c93ae8993cae21bffdef73397' 
  AND token = 'gv/gLmdgvzjq67OKj7AOhCem3DQI7t+gUvD4Y7h33CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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