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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b43432778fc4cc1fdd54ec4cec1c66e0c658f6a10c89d81e1ea3f1db4cb0951' 
  AND token = '/Ouuf0csmlgC4ZC5oz+oWGcD1tjTycqtJDhH2loXN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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