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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2544e970a3497ed944fd08328e36d9e6ab3feb988c3db5883f69b7e6a1784077' 
  AND token = 'JSvu+UbKwLQkWj7HTSmUyFoVaf3HuCpMa02MM6a3jMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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