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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9263e2074413f8cf8e6c7e23ff1fbe68bd4dcee4b24b1519a3d91cda9ccaadd1' 
  AND token = 'AqZQNr6trUN+EAjw/eYWXuJlZEbvU/wvMePOTQ8q7no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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