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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ee78d18c2ee5a98b872a27858b191cf972ce1f18d1399572cd82265ad23586' 
  AND token = '65v1Y4pk3pkQLZ3+aWnxPeEGFs9Db9amtwCpnhwDB6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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