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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39aaaf8e912be827ef05c5e318bef34d3c788b3acb3fe0f5fe2795fc7c158b6d' 
  AND token = '3+v4fqjSs3DQidljJF0pqeVX72lry/4DeGfyQb3rhak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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