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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bac0be34d8de49e23beac02d6bf7dda7461bdd6546fda40baec5bf45feb1e1a' 
  AND token = 'AR0wzenDvtkw6sTn51Ud8s8TWQiT4k5k69GdKTodpe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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