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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4269de8c882dd77449eeb9af6ad19ede1475c4cd35503018123fd4b939d596' 
  AND token = 'xZvqxxMrXLG1Ypt/jlMiyZAAK8S70yrPb0pttBlYYlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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