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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a60d41056c8da0aea8850da79ccb6a4ec20d36f36a5208e49eee639da2da05a' 
  AND token = 'tNgc+8oCsjUd786Ii2rcoTYNpMMIGMncrrIdLoPTTF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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