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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fc76adbf9dfd1c5f593b65d8b77761c20d17b057dcac8ac7b8dc10f0ee230b' 
  AND token = '6afLsx5yD2AOvlbg7dnMghr8cr4zXTeJt7I8tDWuxR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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