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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a286c2be15e8afd217efb630766e94a397f66a21cdf1f1aa0393ad1a4de427' 
  AND token = 'yNMicIQD4ERp4PlJUQZ6h91s6hamLvH5ctLKz8zlGcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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