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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1c1a2ab4c66cde18257a4d1e984613b3b98646af3321a6f30f18bf54f38b8e' 
  AND token = '4ct6eZnDlBtB8Ll6GA4tqne3sPRgGbTNNdT8ljUrk48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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