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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903e3179b5ffaa6deccfdedbabc4b78deb2bde3ac7f1c3cd5f3495ba93cd9bf6' 
  AND token = 'vDo3bl8o+vyRm+HK7ETLRiWCFaOdfRITaZQO/zU+moA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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